71-20
Exhaust Emissions* from a Passenger Car Equipped with
"Brisko's Heavy Duty PCV Valve"
February 1971
Henry L. Gompf
Division of Emission Control Technology
Air Pollution Control Office
ENVIRONMENTAL PROTECTION AGENCY
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71-20
Exhaust Emissions from a Passenger Car Equipped with
"Brisko's Heavy Duty PCV Valve"
February 1971
Henry L. Gompf
Division of Emission Control Technology
Air Pollution Control Office
ENVIRONMENTAL PROTECTION AGENCY
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Device Tested
The exhaust emission characteristics of the "Brisko Heavy
Duty PCV Valve Adaption" was desired as part of the continu-
ing evaluation of retro-fit type devices. Specifically,
interest in testing was expressed by the State of Wisconsin.
The Brisko device replaced the stock PCV valve on a 1970
Chevrolet Impala. This car was equipped with a 350 CID,
300 hp, high compression engine and automatic transmission.
This car is part of the EPA fleet and extensive baseline
data were available.
Test Procedure
The following tests were performed:
6 Baseline tests - vehicle in stock condition.
5 Device tests - vehicle equipped with Brisko device.
All tests were performed according to the Federal test pro-
cedure to be used for the certification of 1972 and later
model vehicles. The 1972 FTP is a constant volume sampling
technique as specified in the November 10, 1970 Federal Register.
The bag samples taken were analyzed using non-dispersive
infrared analysis for carbon monoxide and carbon dioxide.
Hydrocarbons were measured by the flame ionization detector.
Two methods were used to measure oxides of nitrogen: Saltzman
wet chemical and the chemiluminescent technique.
Emission Results
A table is presented at the end of this report containing
individual test data compiled during the evaluation.
Comparing the mean baseline emissions to the mean device
emissions, reductions of 4 percent in hydrocarbons, 13 per-
cent in carbon monoxide and about 10 percent in oxides of
nitrogen are seen. At best these must be considered mar-
ginal reductions since test variability is of the same
magnitude.
Fuel Consumption
The table at the end of the report indicates a 3 percent
increase in fuel economy. Again this percent is too mar-
ginal with respect to test variability. No significant
fuel savings was measured.
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— 2 —
Conclusions
1. Emission reductions were marginal and would not by
themselves warrant installation of the device.
2. Only a marginal fuel saving was measured.
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1970 HEW Chevy - Brisko
1972 Federal Test Procedure
With Brisko Device
Fuel Cons, mpg
Wt.
12.5
15.0
• 12.2
12.7
13.4
13.2
f+14%
1 I -8%
Anal.
12.6
12.5
12.4
13.4
13.1
12.8
+5%
-3%
HC gpm CO gpm
4.20
4.56
4.80
4.32
4.39
4.45
+ 8%
-6%
44.10
47.62
40.30
42.10
46.02
Average
44.03
+8%
-8%
CO 2 gpm
638.38
633.63
654.00
599.60
608.83
626.89
+4%
-4%
NOx* gpm as N02
Saltz.
5.59
4.94
6.66
4.40
4.92
5.30
+ 26%
-17%
CI
6.56
5.76
5.98
6.10
+ 8%
-6%
Baseline
2 [12-4
CIO. 9
f 13.2
. "13.5
I' 13.1
13.5
12.8
if + 5%
[ -15%
12.1
11.4
12.9
13.0
— — — —
12.4
+ 5%
-8%
4.76
5.33
4.65
4.36
4.36
4.29
4.63
+15%
-7%
66.90
51.10
49.68
45.01
44.10
45.35
Average
50.36
+33%
-12%
629.74
695.91
610.90
611.7
561.34
544.69
609.05
+14%
-11%
8.39
4.94
5.26
5.82
0 4.93
5.87
+43%
-16%
5.51
7.38
6.75
6.70
6.59
+11%
-16%
Percent Reductions
-3%
-3%
4%
13%
-3%
10%
7%
* Oxides of nitrogen are corrected for humidity,
1 Percent variability about the mean.
2 Baseline prior to installation of device.
3 Baseline after removal of device.
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